Remote code execution in FortiOS and FortiProxy sslvpnd

1) Out-of-bounds write

EUVDB-ID: #VU75734

Risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-22640

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to a boundary error in sslvpnd. A remote authenticated user can send a specially crafted request to trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.0.0 - 7.2.3

FortiProxy: 1.0.0 - 7.2.1

CPE2.3

• cpe:2.3:o:fortinet:fortios:6.0.0:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.1:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.3:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.4:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.5:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.6:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.7:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.8:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.0.9:*:*:*:*:*:*:*
• cpe:2.3:h:fortinet:fortiproxy:1.0.0:*:*:*:*:*:*:*

External links

https://fortiguard.com/psirt/FG-IR-22-475

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.